<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <ul>
        <li>11</li>
        <li>11</li>
        <li>11</li>
        <li>11</li>
    </ul>
    
</body>
<script>
    function Fon (age,name) {
        this.age = age;
        this.name = name;
      
        console.log('Im'+ name +'is'+age);
      }


      Object.prototype.toString = function(tag) {
          console.log(tag);
      }

      //Object.prototype.
      // Fon(17,'孔小飘')

      let Fun = new Fon;

      Fun.toString('555')


      let obj = {
          a:7
      }

      console.log(obj.__proto__);

      console.log(Object(()=>{
          return '789'
      }));

      console.log(Fon.__proto__, Fon.prototype);

      console.log(Fun.__proto__, Fun.prototype);

      console.log(Fon.prototype,'9999',Fun.__proto__, Fon.prototype == Fun.__proto__ );
      //Fon.toString(5)
</script>
</html>